Here's a link to the Food Standards Agency website.
It's not quite what you want as it doesn't mention freezing, but bacteria can't multiply at freezer temperatures, so I think the advice would be to cool it within an hour and then freeze immediately, then when you defrost it, eat it straight away.
HTH
Quote -
"Uncooked rice can contain spores of Bacillus cereus, bacteria that can cause food poisoning. When the rice is cooked, the spores can survive. Then, if the rice is left standing at room temperature, the spores will germinate into bacteria. These bacteria will multiply and may produce toxins (poisons) that cause vomiting or diarrhoea. Reheating the rice won't get rid of these toxins.
So, the longer cooked rice is left at room temperature, the more likely it is that bacteria, or the toxins they produce, could stop the rice being safe to eat.
It's best to serve rice when it has just been cooked. If that isn't possible, cool the rice as quickly as possible (ideally within one hour) and keep it in the fridge for no more than one day until reheating."